2. 外语
  3. There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. Because people have n

There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. Because people have n

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问题 There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001.
Because people have not convincingly found any alien life forms, such forms are just our_____.
选项
答案imagination
解析 题干关键词与原文conclusively discovered 同义，alien life forms与原文alien physiology同义，因此将答案定位至第三个小标题Speculation：What Might Aliens be Like?下第一段第一句。Since no extraterrestrial life forms have been conclusively discovered，alien physiology lies in the realm of our imagination，据此，空格里可以填入imagination。
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